What is an alcohol barometer?

An alcohol barometer is a device used to measure the alcohol content of a liquid, typically in the context of beverages like beer, wine, or spirits. It operates based on the principle of buoyancy, where the density of the liquid affects the level to which a calibrated float or hydrometer rises. This measurement helps determine the specific gravity of the liquid, which can then be converted into an alcohol percentage. Alcohol barometers are commonly used in brewing and winemaking to ensure the desired alcohol levels in the final product.